empty.html

来自「从www.CppReference.com打包的C++参考手册」· HTML 代码 · 共 92 行

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>empty</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">C++ Maps</a> &gt; <a href="empty.html">empty</a>  </div>  <div class="name-format">    empty  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;map&gt;  bool empty() const;</pre>  <p>The empty() function returns true if the map has no elements,  false otherwise.</p>  <p>For example, the following code uses empty() as the stopping  condition on a <a href= "../keywords/while.html">while</a> loop to  clear a map and display its contents in order:</p>  <pre class="example-code">  struct strCmp {    bool operator()( const char* s1, const char* s2 ) const {      return strcmp( s1, s2 ) &lt; 0;    }  };  ...  map&lt;const char*, int, strCmp&gt; ages;  ages["Homer"] = 38;  ages["Marge"] = 37;  ages["Lisa"] = 8;  ages["Maggie"] = 1;  ages["Bart"] = 11;  while( !ages.empty() ) {    cout &lt;&lt; "Erasing: " &lt;&lt; (*ages.begin()).first &lt;&lt; ", " &lt;&lt; (*ages.begin()).second &lt;&lt; endl;    ages.erase( ages.begin() );  }</pre>  <p>When run, the above code displays:</p>  <pre class="example-code">  Erasing: Bart, 11  Erasing: Homer, 38  Erasing: Lisa, 8  Erasing: Maggie, 1  Erasing: Marge, 37</pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="begin.html">begin</a><br>    <a href="erase.html">erase</a><br>    <a href="size.html">size</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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